sendmail: sendmail (mail transfer agent) sendmail: sendmail: Eric Allman's mail transport agent. The _Unix System Administration sendmail: Handbook_ calls sendmail 'The most complex and complete mail delivery sendmail: system in common use...' sendmail: sendmail: Ready-made configuration files are included for systems connected by sendmail: TCP/IP (with or without a nameserver) and for systems using UUCP. sendmail: sendmail: The procmail package is required to handle local mail delivery. sendmail: